| 摘要 |
An automatic transmission comprises a torque converter, a torque converter case for accommodating the torque converter, a transmission, an input shaft for connecting the torque converter with the transmission, a forward and reverse changeover apparatus including a planetary gear, a planetary carrier and a reverse brake, comprising, a forward clutch drum connected with the input shaft, a forward clutch plate provided between the forward clutch drum and the planetary carrier, a lock-up clutch drum connected with the torque converter case, a lock-up clutch plate provided between the forward clutch drum and the lock-up clutch drum, a lock-up clutch piston slidably fitted to the input shaft for engaging and releasing the lock-up clutch plate and provided inside of said forward clutch drum between the forward clutch drum and the forward and reverse changeover apparatus, a forward clutch piston slidably fitted to the input shaft for engaging and releasing the forward clutch plate and provided inside of the forward clutch drum between the lock-up clutch piston and the forward and reverse changeover apparatus, a first pressure chamber provided between the forward clutch piston and the lock-up clutch piston for operating the forward clutch piston, and a second pressure chamber provided between the lock-up clutch piston and the forward clutch drum for operating the lock-up clutch piston.
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